It was the pic that went down in infamy — a kissy moment between Ariana Grande and Justin Biebercaptured in a selfie. After "The Way" singer posted it to her Twitter account, fans went nuts, wondering if she had left her longtime boyfriend for the Believe superstar. But after Grande put the rumors to bed, the frenzy subsided and she was able to tell the real story to MTV News.

"I think [fans] had trended #JustinAndArianaSelfie or something like that, so I was like, 'we have to do this,' " Ariana told us during "Live from MTV," airing at 7:30 p.m. ET Wednesday (August 21) on AllAccess.MTV.com.

"Yo, let's take a picture," Justin had told her after he met Ariana's grandparents at a meet-and-greet (her Nonna has a BIG crush). Ariana pulled out her phone and smiled for a quick snap.

"I just was smiling and he kissed me on the cheek!" she said, eyes wide. "And I didn't know what to do. I just walked out of the room."

In a panic, Grande did what any person would've done if the heartthrob gave them a smooch, but the pressure didn't stop there.

"I got shy," she said. "And then Scooter came after to me and said, Scooter says Justin says you have to post that picture. And I said, 'I will not.' "

But c'mon, it's Justin Bieber. Pics or it didn't happen! So why was Ariana hesitant?

"I don't want the drama that comes with it," she admitted.

But Bieber got his way, tweeting about the pic and making it public to the Arianators and Beliebers, who were hungry for the matchup after knowing the two were on tour together.

After she posted it, "everyone was like 'oh my god, a kiss on the cheek.' I'm like, 'can you not?' "

The rumors have been put the side recently, and Ariana will be paired with another pop star for the VMA pre-show at 8 p.m. ET on Sunday, August 25. Her and Austin Mahone will take the streets of Brooklyn, singing "The Way," "Baby I" and Austin's "What About Love."